Question

Tìm ƯCLN của 18a+2 và 30a+3

Answer 1

Nhầm ƯCLN=1

Answer 2

ƯCLN(18a+2;30a+3)=6

Answer 3

Gọi \(d=\left(18a+2;30a+3\right)\)

\(\Rightarrow\hept{\begin{cases}18a+2⋮d\\30a+3⋮d\end{cases}}\)

\(\Rightarrow5\left(18a+2\right)-3\left(30a+3\right)⋮d\)

\(\Rightarrow\left(90a+10\right)-\left(90a+9\right)⋮d\)

\(\Rightarrow1⋮d\)

\(\Rightarrow d=1\)

Vậy \(\left(18a+2;30a+3\right)=1\).